ATMEGA88 datasheet(55/349 Pages) ATMEL

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ATmega48/88/168

2545D–AVR–07/04

0x01D

out

SPL,r16

0x01E

sei

; Enable interrupts

0x01F

<instr>

xxx

...

When the BOOTRST Fuse is unprogrammed, the Boot section size set to 2K bytes and

the IVSEL bit in the MCUCR Register is set before any interrupts are enabled, the most

typical and general program setup for the Reset and Interrupt Vector Addresses in

ATmega88 is:

Address

Labels Code

Comments

0x000

RESET: ldi

r16,high(RAMEND); Main program start

0x001

out

SPH,r16

; Set Stack Pointer to top of

RAM

0x002

ldi

r16,low(RAMEND)

0x003

out

SPL,r16

0x004

sei

; Enable interrupts

0x005

<instr>

xxx

;

.org 0xC01

0xC01

rjmp

EXT_INT0

; IRQ0 Handler

0xC02

rjmp

EXT_INT1

; IRQ1 Handler

...

;

0xC19

rjmp

SPM_RDY

; Store Program Memory Ready

Handler

When the BOOTRST Fuse is programmed and the Boot section size set to 2K bytes, the

most typical and general program setup for the Reset and Interrupt Vector Addresses in

ATmega88 is:

Address

Labels Code

Comments

.org 0x001

0x001

rjmp

EXT_INT0

; IRQ0 Handler

0x002

rjmp

EXT_INT1

; IRQ1 Handler

...

;

0x019

rjmp

SPM_RDY

; Store Program Memory Ready

Handler

;

.org 0xC00

0xC00

RESET: ldi

r16,high(RAMEND); Main program start

0xC01

out

SPH,r16

; Set Stack Pointer to top of

RAM

0xC02

ldi

r16,low(RAMEND)

0xC03

out

SPL,r16

0xC04

sei

; Enable interrupts

0xC05

<instr>

xxx

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